A pupil poses for a group photo with sailors aboard a frigate during an open day event held by the South China Sea Fleet of the PLA Navy at a naval base in Sanya, south China’s Hainan Province on April 23, 2017, when the PLA Navy marks its 68th founding anniversary. The guided-missile frigates Qingyuan (Hull 589) and Luzhou (Hull 592) are open to the public during the event. (Photo/81.cn)